Cited by 106Protein Kinase Regulation and GTPase SignalingCellular transport and secretionProtein Tyrosine Phosphatases

Identification and Characterization of RA-GEF-2, a Rap Guanine Nucleotide Exchange Factor That Serves as a Downstream Target of M-Ras

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Gao, Xianlong, Satoh, Takaya, Liao, Yanhong, Song, Chunhua, Hu, Chang-Deng, Kariya, Ken-ichi, Kataoka, Tohru·2001·Journal of Biological Chemistry

Abstract

The Ras family small GTPase Rap is regulated by an array of specific guanine nucleotide exchange factors (GEFs) in response to upstream stimuli. RA-GEF-1 was identified as a novel Rap GEF, which possesses a Ras/Rap1-associating (RA) domain. Here we report a protein closely related to RA-GEF-1, named RA-GEF-2. Like RA-GEF-1, a putative cyclic nucleotide monophosphate-binding domain, a Ras exchanger motif, a PSD-95/DlgA/ZO-1 domain, and an RA domain in addition to the GEF catalytic domain are found in RA-GEF-2. However, RA-GEF-2 displays a different tissue distribution profile from that of RA-GEF-1. RA-GEF-2 stimulates guanine nucleotide exchange of both Rap1 and Rap2, but not Ha-Ras. The RA domain of RA-GEF-2 binds to M-Ras in a GTP-dependent manner, but not to other Ras family GTPases tested, including Ha-Ras, N-Ras, Rap1A, Rap2A, R-Ras, RalA, Rin, Rit, and Rheb, in contrast to the RA domain of RA-GEF-1, which specifically binds to Rap1. In accordance with this, RA-GEF-2 colocalizes with activated M-Ras in the plasma membrane in COS-7 cells, suggesting a role of RA-GEF-2 in the regulation of Rap1 and Rap2, particularly in the plasma membrane. In fact, an increase in the level of the GTP-bound form of plasma membrane-located Rap1 was observed when coexpressed with RA-GEF-2 and activated M-Ras. Thus, RA-GEF-2 acts as a GEF for Rap1 and Rap2 downstream of M-Ras in the plasma membrane, whereas RA-GEF-1 exerts Rap GEF function in perinuclear compartments including the Golgi apparatus.

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  1. Kawasaki, H., Springett, G. M., Toki, S., Canales, J. J., Harlan, P., Blumenstiel, J. P., Chen, E. J., Bany, I. A., Mochizuki, N., Ashbacher, A., Matsuda, M., Housman, D. E., and Graybiel, A. M. (1998) Proc. Natl. Acad. Sci. U. S. A. 95, 13278 -13283
  2. Beranger, F., Goud, B., Tavitian, A., and de Gunzburg, J. (1991) Proc. Natl. Acad. Sci. U. S. A. 88, 1606 -1610

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Authors
Gao, X., Satoh, T., Liao, Y., Song, C., Hu, C.-D., Kariya, K.-I., & Kataoka, T.
Affiliations
  • Kobe University (JP)
  • University of the Ryukyus (JP)
Corresponding author
Kataoka, Tohru
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2001-11
Volume
276
Issue
45
Pages
42219-42225
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2003229639
Cited by
106
References
37
Citations by year
2026: 1 · 2024: 2 · 2023: 1 · 2022: 1 · 2020: 2 · 2019: 7 · 2018: 3 · 2017: 4 · 2016: 1 · 2015: 3 · 2014: 2 · 2013: 1 · 2012: 11
FWCI
3.03
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • Ministry of Education, Culture, Sports, Science and Technology
  • Japan Society for the Promotion of Science
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
Keywords
M-Ras, Rap1, Rap2, plasma membrane localization, Golgi apparatus, tissue distribution
MeSH terms
Amino Acid Sequence, Animals, Biological Transport, Cell Membrane, Cloning, Molecular, Molecular Sequence Data, Protozoan Proteins, COS Cells, Monomeric GTP-Binding Proteins, Guanine Nucleotide Exchange Factors

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